X-ray density changes in the heart recorded by the electrokymograph.
RING
G C
GC
MICHIE
C R
CR
OPPENHEIMER
M J
MJ
D004571:Electrokymography; D006321:Heart; D006801:Humans; D007734:Kymography; D019616:Thoracic Surgical Procedures; D014965:X-Rays